Amoxicillin for my hen with a reproductive infection - please help!!!

[Fwoof]

I have a Americana/Silkie hen currently struggling with what looks like a reproductive infection.
She's around two years old, and hasn't laid for months. I'd been giving her daily calcium citrate+D3 but that didn't seem to help. She is now acting slow and lethargic and won't even eat scrambled eggs. Her crop is squishy but I can't smell anything coming from her beak. Her droppings however... awful...
Curious where everyone sources their amoxicillin, and is there any way to get it without a prescription?
Thank you!!!!!

 

[Eggcessive]

It is available in 10% powder for the water to be given for 10 days:
https://birdpalproducts.com/product...IOBE_YXgT14vbWh6GYbqfzc-LPhrAQzlo1NtUiet0s5sI

Here is some 20%, a bit stronger:
https://globalpigeonsupply.com/prod...SmcDN9kPVdThNX4v6FhpZyxJrQ2DNQ5uO5FWDXDZbRCTG

 

[Fwoof]

It is available in 10% powder for the water to be given for 10 days:
https://birdpalproducts.com/product...IOBE_YXgT14vbWh6GYbqfzc-LPhrAQzlo1NtUiet0s5sI

Here is some 20%, a bit stronger:
https://globalpigeonsupply.com/prod...SmcDN9kPVdThNX4v6FhpZyxJrQ2DNQ5uO5FWDXDZbRCTG

Thank you!!!

Also anyone recommend a particular online chicken veterinarian you trust? I don't have a poultry vet in my area.